Các anh down giúp em các bài báo này.
1. Tutorial on voltage sag analysis
http://ieeexplore.ieee.org/xpl/freea...rnumber=897023
2. Modelling and analysis guidelines for slow transients. Part I. Torsional oscillations; transient torques; turbine blade vibrations; fast bus transfer
http://ieeexplore.ieee.org/xpl/freea...&isnumber=9986
3. Expert system for voltage dip classification and analysis
http://ieeexplore.ieee.org/xpl/freea...rnumber=970122
Cảm ơn.